JP4834932B2 - Seat reclining device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a seat reclining device, and more particularly to a structure of a seat reclining device that can sufficiently withstand even when a large load is applied to a seat back.
[0002]
[Prior art]
Conventionally, as this type of apparatus, one disclosed in JP-A-10-71042 is known. That is, in a reclining device comprising a lower arm fixed to the seat cushion, a lower arm attached to the seat back side and a rotatable upper arm, and a lock mechanism for restricting the rotation of the upper arm with respect to the lower arm, a pair of reclining members configured symmetrically with each other Combined with the mechanism, the strength is improved to withstand a large load. A reclining device that improves such strength on the side where a large load is applied to a seat that is configured such that a seat belt is attached to the seat back and a large load is applied to one side of the seat back from the seat belt, It is attached to the other side as a set with a normal reclining device.
[0003]
[Problems to be solved by the invention]
However, the above-described reclining device with improved strength includes two parts of the lower arm, the upper arm, and the lock mechanism, which increases the number of parts and is expensive.
[0004]
It is an object of the present invention to realize a reclining device that improves strength without increasing the number of parts.
[0005]
[Means for Solving the Problems]
In order to solve the above technical problem, the technical means taken in the present invention includes a first arm supported by one of a seat cushion and a seat back, and is rotatably supported by the first arm. , A second arm supported by the other of the seat cushion and the seat back, an engaged portion formed on the first arm, and engageable with the engaged portion on the second arm In the reclining device having a plurality of poles having engaging portions, a circular first recess is formed on the first arm, and a second recess is formed concentrically with the first recess on the radially inner side of the first recess. The engaged portion is divided into a first engaged portion on the inner surface of the first recess and a second engaged portion on the inner surface of the second recess, and the engaging portion is provided in all of the poles. A first engaging portion that engages with the first engaged portion; and the second engaged portion. Rutotomoni provided separately in a second engaging portion for engagement portion engaging, when said load applied is given below to the first or second arm, the first engaged with the first engagement portion And the second engaging portion and the second engaged portion are set to engage with each other with a gap .
[0006]
The reclining device configured as described above operates so that the first and second engaging portions of the pole and the first and second engaged portions of the first arm are engaged in a double manner. The seat back position is locked with respect to the seat cushion.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
As shown in FIG. 7, the reclining device 10 with improved strength according to the present invention is attached to one side of a seat 100 on which two or more people can sit. The seat 100 includes a seat back 110, a seat cushion 120, and seat belts 101 and 201. One end of one seat belt 101 is fixed by a mounting portion 102 at the top of the seat back 110, and the other seat belt 201 is fixed to a mounting portion 202 of the vehicle body. In the seat with such a configuration, an excessive load is applied to the seat belt 101 side via the attachment portion 102 than the seat belt 201 side in an emergency of the vehicle. The seat reclining device 10 with improved strength is applied to the seat belt 101 side so as to cope with this excessive load. On the other hand, the same seat reclining device 10A as the conventional one is applied to the seat belt 201 side.
[0008]
As shown in FIGS. 1 and 2, the seat reclining device 10 includes a lower arm 1 and an upper arm 2 having a disc-like outer shape. The lower arm 1 is fixed to the seat cushion frame A by welding, and the upper arm 2 is fixed to the seat back frame B by welding. The lower arm 1 and the upper arm 2 are assembled to face each other so that the disk shapes overlap each other.
[0009]
A recess 11 is formed in the lower arm 1 by a so-called half punching method in which a depression is made by pressing in the thickness direction of the material to make a step. The recess 11 has an inner peripheral surface 11 a that opens in the direction of the upper arm 2 and that has a rotation axis C common to the upper arm 2 and the lower arm 1.
[0010]
The upper arm 2 is arranged at its circular outer peripheral surface 21 so as to be in sliding contact with the inner peripheral surface 11a of the lower arm 1, and the sliding contact surfaces of the lower arm 1 and the upper arm 2 function as shafts and bearings in mutual rotation. Yes.
[0011]
Further, the folder 90 is disposed so as to cover the outer periphery of the upper arm 2, and the inner side surface of the folder 90 is in contact with and supported by the side surface of the lower arm 1. As a result, the upper arm 2 and the lower arm 1 are held in a state where they are assembled so as to be rotatable.
[0012]
The upper arm 2 is formed with a half-cut recess 25, which opens to the lower arm 1 side. The inner periphery of the recess 25 centered on the rotation axis C has a first inner tooth 25a over the entire circumference. (First engaged portion) is formed. Inside the concave portion 25, a circular concave portion 26 is formed that is further half cut out so as to have an inner peripheral surface portion concentric with the concave portion 25. On the inner peripheral surface portion of the recess 26, second inner teeth 26a (second engaged portions) are formed over the entire periphery. Further, a circular concave portion 27 is formed on the inner side of the concave portion 26 so as to be half-drilled and formed one step deeper so as to have an inner peripheral surface portion concentric with the concave portions 25 and 26. A first stopper portion 27a and a second stopper portion 27b are formed on the inner peripheral surface portion of the recess 27 so as to protrude toward the rotation axis C with a predetermined angular interval. A convex portion 27c is formed between the first stopper portion 27a and the second stopper portion 27b. The convex portion 27c has a lower shape than the stopper portions 27a and 27b.
[0013]
A lock mechanism 3 is disposed between the lower arm 1 and the upper arm 2. The lock mechanism 3 includes three poles 50 and 60 as shown in FIGS. 3 and 4, which are arranged in a plane orthogonal to the rotation axis C, with three equal angular intervals. The pole 50 (first pole) has the protrusion 51 on the side surface, and the pole 60 (second pole) has the same shape as the pole 50 only without the protrusion 51. One pole 50 and two poles 60 are provided.
[0014]
As shown in FIG. 3 and FIG. 4, each pole 50, 60 is made from a plate-shaped steel material by a method such as forging, and has two surface portions, a first surface portion 52, 62 and a second surface portion 53, 63. However, they are connected to each other with a step, and the outer shape as a whole is formed into a substantially rectangular shape. The front end surfaces of the first surface portions 52 and 62 are formed with two steps, and the front end surfaces of the first surface portions 52 and 62 can be engaged with the first inner teeth 25a of the upper arm 2. First outer teeth 54a and 64a (first engaging portion) and second outer teeth 54b and 64b (second engaging portion) that can engage with the second inner tooth 26a are formed. Yes. As shown in FIG. 6, when the first inner teeth 25a and the first outer teeth 54a, 64a are in contact with each other, the second inner teeth 26a and the second outer teeth 54b, 64b It is formed so as to ensure a minute gap between the teeth.
[0015]
Further, as shown in FIGS. 1 and 5, on the side opposite to the side shown in FIGS. 3 and 4 of the poles 50 and 60, on the end face facing the external teeth 54 and 64, that is, the first surface portions 52 and 62. The cam surfaces 55 and 65 are formed at the step portions of the second surface portions 53 and 63. Cam holes 56 and 66 are formed in the second surface portions 53 and 63 so as to penetrate in the plate thickness direction. 3 and 4, the left and right end faces of the poles 50 and 60 are formed in a straight line having a certain width dimension in the vertical direction.
[0016]
On the other hand, as shown in FIG. 1, three pairs of parallel guide walls 12 are provided in the recess 11 of the lower arm 1 so as to protrude from the poles 50 and 60 with a spacing of approximately the same size as the left and right widths. Yes. The poles 50 and 60 are fitted and assembled between the guide walls 12, and each of the poles 50 and 60 can slide along the guide wall 12 to move toward or away from the rotation axis C. Yes.
[0017]
As shown in FIGS. 1 and 2, the lock mechanism 3 further includes a cam 40.
[0018]
The cam 40 has a cam surface 41. The cam surface 41 is located in the recesses 25 and 26 of the upper arm 2 and is arranged so as to be rotatable about the rotation axis C. Three cam surfaces 41 are formed at equal intervals, and can come into contact with the cam surfaces 55 and 65 (FIGS. 5 and 6) of the poles 50 and 60, respectively. The cam surface 41 and the cam surfaces 55 and 65 of the respective poles 50 and 60 are arranged so that the first and second external teeth 54a, 64a and 54b of the poles 50 and 60 are obtained by rotating the cam 40 counterclockwise in FIG. The shape is such that 64b can be pressed so as to mesh with the inner teeth 25, a. On the side surface of the cam 40 that is closer to the rotation axis C than each cam surface 41, a protruding pin 47 that protrudes so as to be inserted into the cam holes 56 and 66 of the poles 50 and 60 is formed. The shape of the cam holes 56, 66 is such that when the cam 40 is rotated clockwise in FIG. 1 by the projection pin 47, the first and second external teeth 54a, 54b, 64a, 64b of the poles 50, 60 are respectively connected to the upper arm 2. The first and second inner teeth 25a and 26a can be separated from each other.
[0019]
As shown in FIGS. 1 and 2, the hinge shaft 70 is disposed on the rotation axis C and is inserted into through holes 13, 42, and 23 provided in the lower arm 1, the cam 40, and the upper arm 2, respectively. A spline 71 having a plurality of grooves that open in the radial direction and extend in the axial direction is formed on a substantially central portion in the axial direction of the hinge shaft 70. On the other hand, a female spline 42a that engages with the spline 71 of the hinge shaft 70 is formed on the inner periphery of the through hole 42 of the cam 40, and the hinge shaft 70 and the cam 40 are configured to rotate integrally. . The hinge shaft 70 is held in an assembled state by a retaining ring 88.
[0020]
Further, as shown in FIG. 2, a serration 74 having a plurality of tooth grooves extending in the axial direction is formed on the outer peripheral portion of one end of the hinge shaft 70. An operation handle 85 having a serration hole that engages with the serration 74 is integrally attached. The cam 40 can be rotated by operating the operation handle 85. The hinge shaft 70 further has a serration 75 at an end opposite to the end to which the operation handle 85 is attached, and a connecting rod 78 that engages with the serration 75 is attached. The connecting rod 78 connects a hinge shaft (not shown) of the reclining device 10A attached to the other side of the seat 100 (FIG. 7). Accordingly, the reclining devices 10 and 10A can be locked or unlocked simultaneously.
[0021]
As shown in FIGS. 1 and 2, the lower arm 1 is formed with a circular concave portion 16 that is concentric with the concave portion 11 and is half-cut deeper than the concave portion 11. A groove 14 extending radially outward is formed at one place on the inner peripheral surface of the recess 16, while a groove 46 is provided in the boss 45 of the cam 40 as shown in FIG. 1. A spring 86 is attached to the groove 14 with one end locked to the groove 46 and the other end locked. The spring 86 is a spiral spring whose center substantially coincides with the rotation axis C. In FIG. 1, an acting force is applied so that the cam 40 is always rotated counterclockwise, and the cam surfaces 55 and 65 of the poles 50 and 60 are pressed by the cam surface 41 of the cam 40, and the external teeth 54 a and 54 b are pressed. , 64a, 64b are firmly engaged with the inner teeth 25a, 26a, respectively.
[0022]
Next, the operation of the reclining device 10 configured as described above will be described.
[0023]
FIG. 1 shows a locked state of the reclining device 10. In this state, the cam 40 and the cam surfaces 55 and 65 of the poles 50 and 60 come into contact with each other, the poles 50 and 60 are pushed, and the external teeth 54a, 54b, 64a and 64b of the poles 50 and 60 and the internal teeth 25a of the upper arm 2 are pressed. , 26a mesh with each other, and the rotation of the upper arm 2 and the lower arm 1 is restricted.
[0024]
When the operation handle 85 is operated in this state, the hinge shaft 70 rotates clockwise in FIG. 1 against the urging force of the spring 86 integrally with the cam 40. The cam surface 41 is disengaged from the cam surfaces 55 and 65 of the poles 50 and 60, and the poles 50 and 60 are moved along the guide wall 12 by the action of the cam holes 56 and 66 of the pole and the projection pins 47 of the cam 40. Thus, it is drawn toward the rotation axis C side. Then, the engagement between the outer teeth 54a, 54b, 64a, 64b of the poles 50, 60 and the inner teeth 25a, 26a of the upper arm 2 is released, and the reclining device 10 is in the unlocked state. Further, the lock of the reclining device 10 </ b> A configured to interlock with the connecting rod 78 is also released.
[0025]
In this state, the seat back supported by the seat back frame B can be rotated to an arbitrary position with respect to the seat cushion supported by the seat cushion frame A.
[0026]
Thus, when the seat back is rotated forward by a predetermined angle or more in a so-called forward angle range in the unlocked state, the protrusion 27c formed on the inner peripheral surface of the recess 26 of the upper arm 2 is positioned as shown in FIG. From the projection 51 formed on the side surface of the pole 50 and the inner teeth 25a and 26a. In this state, when the operation handle 85 is released, the cam 40 presses the pawl 50 in the meshing direction of the inner teeth 25a by the acting force of the spring 86, but the pawl 50 moves due to the contact between the projection 27c and the surface 51a of the projection 51. Is blocked and no meshing occurs. At this time, the cam slot 56 and the projecting pin 47 abut and the cam 40 is held in the unlocked position. Accordingly, the other two poles 60 actuated by the cam 40 are similarly held at positions released from the internal teeth 25a and 26a. Thus, in the angle range where the protrusions 27c are formed, the seat back is rotated without being locked. Usually, a spring means (not shown) is attached to act to tilt the seat back forward with respect to the seat cushion. In this forward angle range, a large angle range is rotated at once by the acting force of the spring means, and the rear part Make it easy to get on and off the seat.
[0027]
When the seat back is moved forward, that is, when the upper arm 2 is rotated counterclockwise with respect to the lower arm 1 in FIG. 1, the projection 51 of the pole 50 comes into contact with the first stopper 27a on its side surface 51b, and the lower arm is further increased. The rotation of the upper arm 2 with respect to 1 is prevented.
[0028]
When returning the seat back to the position where the occupant is seated and used, the operation handle 85 is operated to release the pawls 50 and 60 from meshing with the inner teeth 25a and 26a, and cause the seat back.
[0029]
In addition to the first stopper 27a that defines the maximum tilt angle when the seat back is rotated forward, the inner peripheral surface of the recess 27 of the upper arm 2 is rotated backward. A second stopper 27b for defining the maximum angle is provided. The operation is the same as in the case of the first stopper 27a, and the protrusion 51 and the stopper 27b come into contact with each other to prevent further rotation of the upper arm 2. The seat back can be set to rotate greatly so as to be substantially horizontal to the seat cushion at the maximum backward tilt position of the seat back.
[0030]
As described above, in the normal locking operation of the recliner device 10, since the first inner teeth 25a and the first outer teeth 54a and 64a are in contact with each other and mesh with each other, the meshing is maintained without any gaps, and vibration is not generated. Not affected. In the case of an emergency in which an excessive load in the forward direction acts on the seat back from the seat belt 101 due to a vehicle frontal collision or the like, the excessive load causes the first inner teeth 25a and the first outer teeth 54a and 64a to move. Causes slight deformation. As a result, the minute gaps between the second inner teeth 26a and the second outer teeth 54b and 64b are eliminated and come into contact with each other, so that an excessive load is shared.
[0031]
【The invention's effect】
According to the present invention, during normal operation, the reclining device is affected by vibrations and the like, as in the conventional reclining device, by engaging and engaging the external teeth of a pair of poles with the internal teeth of the upper arm. Thus, a secure lock can be secured so that no abnormal noise or play occurs. Furthermore, when an excessive load is applied, the outer teeth of another set of poles and the inner teeth of the upper arm can be brought into contact with each other to share the load, thereby improving the strength of the reclining device. Become.
[0032]
By forming the outer teeth separately on one pole and forming the inner teeth separately on one upper arm, the strength of the reclining device can be improved without increasing the number of parts.
[0033]
In addition, when the upper arm is removed from the first inner teeth after molding, it becomes the same shape as the upper arm of the conventional recliner device, so it can be manufactured using the same manufacturing mold and attached to the other side of the seat. Therefore, the manufacturing cost can be reduced.
[Brief description of the drawings]
FIG. 1 is a plan view of a seat reclining device according to the present invention, partially including a cross-sectional view taken along a line II-II in FIG.
2 is a cross-sectional view taken along a line II-II shown in FIG.
FIG. 3 shows a perspective view of a pole of a reclining device according to the present invention.
FIG. 4 shows a perspective view of a pole of a reclining device according to the present invention.
FIG. 5 is a perspective view from the back of the pole of the reclining device according to the present invention with respect to the state shown in FIGS.
FIG. 6 is an enlarged view of a VI portion shown in FIG.
FIG. 7 is a perspective view showing a seat on which a seat reclining device according to the present invention is mounted.
[Explanation of symbols]
1 Lower arm (second arm)
2 Upper arm (first arm)
25 1st recessed part 25a Internal tooth (1st to-be-engaged part)
26 2nd recessed part 26a Internal tooth (2nd to-be-engaged part)
50 pole 54a external teeth (first engaging part)
54b External teeth (second engaging part)
60 pole 64a external teeth (first engaging part)
64b External teeth (second engaging part)

Claims (1)

A first arm supported by either the seat cushion or the seat back;
A second arm rotatably supported by the first arm and supported by either the seat cushion or the seat back;
In the reclining device comprising a plurality of poles having an engagement portion formed on the first arm and an engagement portion engageable with the engagement portion on the second arm,
A circular first concave portion is formed on the first arm, a second concave portion is formed concentrically with the first concave portion on a radial inner side of the first concave portion, and the engaged portion is formed on the inner surface of the first concave portion. A first engaged portion and a second engaged portion on the inner surface of the second recess;
In all of the poles, the engaging portion is divided into a first engaging portion that engages with the first engaged portion and a second engaging portion that engages with the second engaged portion. And
When the load acting on the first or second arm is equal to or less than a predetermined value, the first engaging portion and the first engaged portion are brought into contact with each other and engaged, and the second engaging portion and the second engaged portion are engaged. The seat reclining device , wherein the engaging portions are set to engage with each other with a gap .

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